J/ApJ/714/1305        The Deep SWIRE Field (DSF) IV.         (Strazzullo+, 2010)
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The Deep SWIRE Field.
IV. First properties of the sub-mJy galaxy population:
redshift distribution, AGN activity, and star formation.
    Strazzullo V., Pannella M., Owen F.N., Bender R., Morrison G.E.,
    Wang W.-H., Shupe D.L.
   <Astrophys. J., 714, 1305-1323 (2010)>
   =2010ApJ...714.1305S
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ADC_Keywords: Active gal. nuclei ; Galaxies, IR ; Galaxies, radio ;
              Magnitudes, absolute ; Redshifts
Keywords: cosmology: observations - galaxies: active - galaxies: evolution -
          galaxies: starburst - radio continuum: galaxies

Abstract:
    We present a study of a 20cm selected sample in the Deep Spitzer
    Wide-area InfraRed Extragalactic Legacy Survey Very Large Array Field,
    reaching a 5{sigma} limiting flux density at the image center of
    S_1.4GHz_~13.5uJy. In a 0.6x0.6deg^2^ field, we are able to assign an
    optical/IR counterpart to 97% of the radio sources. Up to 11 passbands
    from the NUV to 4.5um are then used to sample the spectral energy
    distribution (SED) of these counterparts in order to investigate the
    nature of the host galaxies. By means of an SED template library and
    stellar population synthesis models, we estimate photometric
    redshifts, stellar masses, and stellar population properties, dividing
    the sample into three sub-classes of quiescent, intermediate, and
    star-forming galaxies. We focus on the radio sample in the redshift
    range 0.3<z<1.3 where we estimate to have a redshift completeness
    higher than 90% and study the properties and redshift evolution of
    these sub-populations.

Description:
    The sample of radio sources used here is described in detail in paperI
    (Owen & Morrison 2008, Cat. J/AJ/136/1889). The Deep SWIRE Field (DSF)
    was observed with the VLA in the A, B, C, and D configurations for a
    total of almost 140hr on-source between 2001 December and 2004
    January. The final image has a resolution of 1.6", with a typical rms
    at the center of the image of 2.7uJy (see paper I for details).

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat     64     1580   Main derived properties used in this work
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See also:
   J/ApJS/182/625 : WIYN spectroscopy in the deep SWIRE field (Owen+, 2009)
   J/AJ/137/4846  : 90cm observations of the deep SWIRE field (Owen+, 2009)
   J/AJ/136/1889  : 20cm observations of deep Swire Field (Owen+, 2008)
   J/AJ/105/853   : Energy distributions of radio galaxies (Impey+ 1993)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label   Explanations
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   1-  5  I5    ---    [OM2008] Identification number (1)
   7-  8  I2    h       RAh     Hour of Right Ascension (J2000) (1)
  10- 11  I2    min     RAm     Minute of Right Ascension (J2000) (1)
  13- 17  F5.2  s       RAs     Second of Right Ascension (J2000) (1)
      19  A1    ---     DE-     Sign of declination (J2000) (1)
  20- 21  I2    deg     DEd     Degree of Declination (J2000) (1)
  23- 24  I2    arcmin  DEm     Arcminute of Declination (J2000) (1)
  26- 29  F4.1  arcsec  DEs     Arcsecond of Declination (J2000) (1)
  31- 34  F4.2  ---     z       Redshift, spectroscopic if e_z is blank (2)
  36- 39  F4.2  ---   e_z       ? Uncertainty in z
  41- 42  A2    ---   q_z       Quality flag in z (3)
  44- 48  F5.1  mag     RMag    ? Synthetic Johnson R band absolute AB mag. (4)
  50- 53  F4.2  mag     U-B     ? Synthetic restframe (U-B) AB color index (4)
  55- 59  F5.2 [Msun]   logM    ? Log base 10 of stellar mass; Salpeter IMF (4)
  61- 64  F4.2 [Msun] e_logM    ? Uncertainty in logM
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Note (1): As in Paper I (Owen & Morrison 2008, Cat. J/AJ/136/1889). Note that
          only objects with available spectroscopic redshift or reliable photo-z
          are listed. See text for details about how these quantities were
          derived.
Note (2): Spectroscopic redshift where available, otherwise photometric
          redshift. Redshifts without an error listed are spectroscopic.
Note (3): Quality flag for photometric redshifts, as defined in section 5.1 as
          follows:
   AA = a photo-z is determined in all different realizations, the total number
        of upper limits plus flagged magnitudes is less than 5, the maximum
        difference {Delta}z/(1+z) among the different determinations is less
        than 20%, the estimated error on the photo-z is less than 0.2(1+z).
    A = same as AA but the constrain on the estimated error is relaxed to
        0.4(1+z).
    B = same as A but constrain on the number of flagged magnitudes plus upper
        limits is increased to less than 7.
   C1 = same as B but no constrain on the estimated error on photo-z.
Note (4): Assuming the redshift listed in column 4. Both R band magnitude
     and stellar mass estimates are based on SED fitting in a 1.5" aperture
     and corrected for each object based on the difference between total
     and aperture magnitudes as measured in the detection image, as
     explained in section 6.
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History:
    From electronic version of the journal

References:
    Owen & Morrison., Paper I.   2008AJ....136.1889O, Cat. J/AJ/136/1889
    Owen F.N. et al., Paper II.  2009AJ....137.4846O, Cat. J/AJ/137/4846
    Owen F.N. et al., Paper III. 2009ApJS..182..625O, Cat. J/ApJS/182/625

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(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    23-Apr-2012